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A kind of method for preparing butene and butadiene by catalytic dehydrogenation of butane

A technology for catalytic dehydrogenation and butadiene, applied in chemical instruments and methods, catalyst activation/preparation, catalysts, etc., can solve problems such as deactivation, easy carbon deposition, environmental pollution, etc., and achieve large industrial value and application prospects. Good stability and reproducibility, environmental friendly effect

Active Publication Date: 2021-10-19
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, high temperature is likely to cause excessive dehydrogenation of butane to form carbon deposits. Therefore, to achieve selective dehydrogenation, higher requirements are placed on the design of catalysts.
As far as the current industrial catalysts are concerned, Pt catalysts are prone to carbon deposition. Although high-temperature regeneration can burn off carbon deposits, high temperatures can easily cause Pt sintering and deactivation.
Although it has been reported that the addition of Sn can effectively prevent Pt sintering, the regeneration process requires chlorination, which has a corrosive effect on equipment
Cr-based catalysts also have similar problems. Cr will migrate to the carrier alumina under high temperature conditions, resulting in the loss of active components.
On the other hand, the use of Cr will also cause environmental pollution.

Method used

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  • A kind of method for preparing butene and butadiene by catalytic dehydrogenation of butane
  • A kind of method for preparing butene and butadiene by catalytic dehydrogenation of butane
  • A kind of method for preparing butene and butadiene by catalytic dehydrogenation of butane

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Experimental program
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Effect test

Embodiment 1

[0033] A certain amount of zirconium nitrate was weighed and prepared into a solution, and then impregnated with equal volume on the silicon-aluminum composite carrier. After impregnation, it was aged for 1 hour and then dried overnight in an oven at 100°C. The obtained catalyst was calcined at 750°C for 2 hours to obtain catalyst cat 1.

[0034] The mass fraction of zirconium in the catalyst obtained in the present embodiment is 4.47%. The specific surface area, pore volume and pore diameter of the catalyst are as shown in Table 1, and the X-ray diffraction pattern is as shown in Table 1. figure 1 shown.

Embodiment 2

[0036] According to the mass ratio of metal zirconium and metal gallium being 3.5:1, a certain amount of zirconium and gallium precursors zirconium nitrate and gallium nitrate were weighed and prepared into a mixed solution, and then impregnated in equal volume on the silicon-aluminum composite carrier. After impregnation, it was aged for 1 hour and then dried overnight in an oven at 100°C. The obtained catalyst was calcined at 750°C for 2 hours to obtain catalyst cat 2.

[0037]The mass fraction of zirconium in the catalyst obtained in this example was 3.53%, and the mass fraction of gallium was 0.81%. The specific surface area, pore volume and pore diameter of this catalyst are as shown in Table 1, and the X-ray diffraction figure is as follows figure 1 shown.

Embodiment 3

[0039] According to the mass ratio of metal zirconium and metal gallium as 2:2.5, a certain amount of zirconium and gallium precursors zirconium nitrate and gallium nitrate were weighed and prepared into a mixed solution, and then impregnated in equal volume on the silicon-aluminum composite carrier. After impregnation, it was aged for 1 hour and then dried overnight in an oven at 100°C. The obtained catalyst was calcined at 750°C for 2 hours to obtain catalyst cat 3.

[0040] The mass fraction of zirconium in the catalyst obtained in this example was 1.89%, and the mass fraction of gallium was 2.23%. The specific surface area, pore volume and pore diameter of this catalyst are as shown in Table 1, and the X-ray diffraction figure is as follows figure 1 shown.

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Abstract

The invention provides a method for preparing butene and butadiene by catalytic dehydrogenation of butane, using a dual-active component composite catalyst containing zirconium and gallium, butane is dehydrogenated efficiently, and the selectivity of butadiene in the product reaches 17 %, the selectivity of total butene reaches 81.5%, and the catalyst shows good stability and reproducibility at high temperature.

Description

technical field [0001] The invention relates to a method for preparing butene and butadiene, in particular to a method for preparing butene and butadiene by catalytic dehydrogenation of butane. Background technique [0002] Butene is the basic raw material of petrochemical industry, second only to ethylene and propylene in petrochemical olefin raw materials, and is an important monomer of synthetic rubber and polymer materials. Generally speaking, butene mainly has several isomers, such as n-butene (1-butene), isobutene, cis-dibutene and trans-dibutene. N-butene is mainly used in the manufacture of methyl ethyl ketone, sec-butanol, butylene oxide and butene polymers and copolymers. Isobutylene is mainly used in the manufacture of butyl rubber, polyisobutylene rubber and various plastics. Generally speaking, 1-butene and 2-butene do not need to be separated, and can be chemically processed together to produce many important basic organic chemical products, such as hydration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/08C07C11/09C07C11/167B01J23/08B01J29/40B01J29/70B01J37/02B01J37/08B01J37/18B01J35/10
CPCC07C5/3335C07C5/373B01J23/08B01J29/405B01J29/7057B01J29/7088B01J37/0201B01J37/088B01J37/18C07C2523/08C07C2529/40C07C2529/70B01J35/635B01J35/647B01J35/615C07C11/08C07C11/167C07C11/09
Inventor 张桥徐勇曹暮寒刘其鹏杨迪
Owner SUZHOU UNIV
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